NM_181523.3:c.427+81A>G

Variant names:

• chr5-68273563-A-G
• rs2302974
• NM_181523.3:c.427+81A>G

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_181523.3(PIK3R1):​c.427+81A>G variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000193 in 1,035,490 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 0.0000019 (0 hom.)
• Consequence: PIK3R1 NM_181523.3 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -1.69
• Publications: 0 publications found

Genes affected

PIK3R1 (HGNC:8979): (phosphoinositide-3-kinase regulatory subunit 1) Phosphatidylinositol 3-kinase phosphorylates the inositol ring of phosphatidylinositol at the 3-prime position. The enzyme comprises a 110 kD catalytic subunit and a regulatory subunit of either 85, 55, or 50 kD. This gene encodes the 85 kD regulatory subunit. Phosphatidylinositol 3-kinase plays an important role in the metabolic actions of insulin, and a mutation in this gene has been associated with insulin resistance. Alternative splicing of this gene results in four transcript variants encoding different isoforms. [provided by RefSeq, Jun 2011]

PIK3R1 Gene-Disease associations (from GenCC):

• immunodeficiency 36 with lymphoproliferation

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics
• PIK3R1-related immunodeficiency and SHORT syndrome

  Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
• SHORT syndrome

  Inheritance: AD Classification: DEFINITIVE, STRONG, MODERATE, SUPPORTIVE Submitted by: G2P, Genomics England PanelApp, Labcorp Genetics (formerly Invitae), Orphanet, Ambry Genetics, ClinGen
• agammaglobulinemia 7, autosomal recessive

  Inheritance: AR Classification: STRONG, LIMITED Submitted by: G2P, Labcorp Genetics (formerly Invitae), Ambry Genetics, ClinGen
• activated PI3K-delta syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• autosomal agammaglobulinemia

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Likely_benign. The variant received -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.85).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_181523.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	PIK3R1	NM_181523.3	MANE Select	c.427+81A>G		intron	N/A	NP_852664.1	A0A2X0SFG1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	PIK3R1	ENST00000521381.6	TSL:1 MANE Select	c.427+81A>G		intron	N/A	ENSP00000428056.1	P27986-1
	PIK3R1	ENST00000517412.2	TSL:1	n.1108A>G		non_coding_transcript_exon	Exon 3 of 3
	PIK3R1	ENST00000697461.1		c.427+81A>G		intron	N/A	ENSP00000513319.1	P27986-4

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome AF: 0.00000193 AC: 2 AN: 1035490 Hom.: 0 Cov.: 14 AF XY: 0.00000188 AC XY: 1 AN XY: 533310

African (AFR) AF: 0.00 AC: 0 AN: 24912

American (AMR) AF: 0.0000459 AC: 2 AN: 43574

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 23346

East Asian (EAS) AF: 0.00 AC: 0 AN: 37706

South Asian (SAS) AF: 0.00 AC: 0 AN: 77336

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 52060

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 4946

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 725138

Other (OTH) AF: 0.00 AC: 0 AN: 46472

GnomAD4 genome Cov.: 31

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.85
CADD	Benign	0.032
DANN	Benign	0.57
PhyloP100		-1.7

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs2302974; hg19: chr5-67569391;